/* ============================================================
   LEOSTUDIO — sections/nav.css
   Navegación principal fija: transparente sobre el hero,
   con blur al scrollear (.is-scrolled la añade js/main.js).
   Mobile-first. Depende de: tokens.css, base.css.
   ============================================================ */

/* === NAV: BARRA === */

.ls-nav {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  height: var(--nav-height);
  background: transparent;
  border-bottom: 1px solid transparent;
  transition: background var(--transition-base),
              border-color var(--transition-base),
              box-shadow var(--transition-base),
              backdrop-filter var(--transition-base);
}

.ls-nav.is-scrolled {
  background: rgba(250, 250, 251, 0.85); /* --bg-base al 85% — valor del brief Sprint 3 */
  border-bottom: 1px solid var(--border-soft);
  box-shadow: var(--shadow-card);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
}

/* Con el menú mobile abierto, la barra deja de ser transparente
   para que el menú no "flote" desconectado sobre el hero */
.ls-nav:has(.ls-nav__mobile.is-open) {
  background: var(--bg-base);
  border-bottom-color: var(--border-soft);
}

.ls-nav__inner {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
  height: 100%;
}

/* === LOGO === */

.ls-nav__logo {
  display: flex;
  align-items: center;
  gap: 10px;
}

.ls-nav__logo-img {
  height: 36px;
  width: auto;
  display: block;
}

.ls-nav__logo-text {
  font-family: var(--font-display);
  font-size: 1.25rem;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.ls-nav__logo-text strong {
  font-weight: 800;
}

/* === LINKS DESKTOP === */

.ls-nav__links {
  display: none;
}

@media (min-width: 768px) {
  .ls-nav__links {
    display: flex;
    gap: var(--space-md);
    margin: 0 0 0 auto;
    padding: 0;
    list-style: none;
  }

  .ls-nav__links a {
    color: var(--text-secondary);
    font-size: 0.9375rem;
    transition: color var(--transition-fast);
  }

  .ls-nav__links a:hover {
    color: var(--text-primary);
  }
}

/* === CTA === */

.ls-nav__cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  padding: var(--space-xs) var(--space-md);
  border-radius: var(--radius-btn);
  background: var(--gradient-primary);
  color: var(--text-on-dark);
  font-size: 0.9375rem;
  font-weight: 500;
  transition: opacity var(--transition-fast),
              transform var(--transition-fast);
}

.ls-nav__cta:hover {
  opacity: 0.9;
  transform: translateY(-1px);
}

/* El CTA de la barra solo existe en desktop; el del menú mobile tiene el suyo */
.ls-nav__inner > .ls-nav__cta {
  display: none;
}

@media (min-width: 768px) {
  .ls-nav__inner > .ls-nav__cta {
    display: inline-flex;
  }
}

/* === HAMBURGER (solo mobile) === */

.ls-nav__hamburger {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  margin-left: auto;
  padding: var(--space-xs);
  background: transparent;
  border: 0;
  cursor: pointer;
}

.ls-nav__hamburger span {
  width: 22px;
  height: 2px;
  border-radius: var(--radius-pill);
  background: var(--text-primary);
  transition: transform var(--transition-base),
              opacity var(--transition-base);
}

/* Las líneas exteriores rotan en X, la central desaparece */
.ls-nav__hamburger.is-open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.ls-nav__hamburger.is-open span:nth-child(2) {
  opacity: 0;
}

.ls-nav__hamburger.is-open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

@media (min-width: 768px) {
  .ls-nav__hamburger {
    display: none;
  }
}

/* === MENÚ MOBILE === */

.ls-nav__mobile {
  overflow: hidden;
  max-height: 0;
  opacity: 0;
  visibility: hidden;
  padding: 0 var(--space-sm);
  background: var(--bg-base);
  border-top: 1px solid var(--border-soft);
  transition: max-height var(--transition-slow),
              opacity var(--transition-base),
              padding var(--transition-slow),
              visibility var(--transition-base);
}

.ls-nav__mobile.is-open {
  max-height: 420px;
  opacity: 1;
  visibility: visible;
  padding: var(--space-md) var(--space-sm);
}

.ls-nav__mobile ul {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  margin: 0 0 var(--space-md) 0;
  padding: 0;
  list-style: none;
}

.ls-nav__mobile ul a {
  display: block;
  padding-block: var(--space-xs);
  color: var(--text-primary);
  font-size: 1.125rem;
  font-weight: 500;
}

.ls-nav__mobile .ls-nav__cta {
  display: flex;
  width: 100%;
}

@media (min-width: 768px) {
  .ls-nav__mobile {
    display: none;
  }
}